EVAL-AD7176-2SDZ User Guide UG-478 One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.
UG-478 EVAL-AD7176-2SDZ User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Analog Inputs.................................................................................6 Online Resources .............................................................................. 1 Sockets/Connectors ......................................................................7 Equipment Needed .............................................
EVAL-AD7176-2SDZ User Guide UG-478 EVAL-AD7176-2SDZ QUICK START GUIDE To begin using the evaluation board, do the following: 2. With the EVAL-SDP-CB1Z board disconnected from the USB port of the PC, install the AD7176-2 evaluation board software from the CD included in the evaluation board kit. The PC must be restarted after the software installation is complete. (For complete software installation instructions, see the Software Installation Procedures section.
UG-478 EVAL-AD7176-2SDZ User Guide EVALUATION BOARD HARDWARE DEVICE DESCRIPTION The AD7176-2 is a low noise, fast settling, multiplexed, 2-/4channel (fully differential/pseudo differential) Σ-Δ ADC. The AD7176-2 has a maximum channel-to-channel scan rate of 50 kSPS (20 µs) for fully settled data. The output data rates range from 5 Hz to 250 kHz.
EVAL-AD7176-2SDZ User Guide Link No. SL9 Default Option B SL10 B SL11 B AVSS to AGND UG-478 Description With this link in Position A, the AIN2 analog input on the AD7176-2 device is connected to Connector J8. With this link in Position B, the analog input applied via Connector J8 is buffered using the AD8656 before being applied to the AIN2 pin.
UG-478 EVAL-AD7176-2SDZ User Guide POWER SUPPLIES The evaluation board requires that an external power supply— either a bench top supply or a wall wart (dc plug) supply—be applied to J4 or J5 (see Table 3 for more information). Linear regulators generate the required power supply levels from the applied VIN rail. The regulators used are the 5 V ADP1720 (U7) and the 2.5 V ADP1720 (U4), which supply 5 V and 2.5 V, respectively, to AVDD1/AVDD2 of the ADC. The 3.3 V ADP1720 (U10) delivers 3.
EVAL-AD7176-2SDZ User Guide UG-478 SOCKETS/CONNECTORS Table 4. Connector Details Connector J1 Function Connector to EVAL-SDP-CB1Z Connector Type 120-way connector, 0.6 mm pitch Manufacturer/Part No. Hirose FX8-120S-SV(21) Order No.
UG-478 EVAL-AD7176-2SDZ User Guide REFERENCE OPTIONS The EVAL-AD7176-2SDZ includes an external 5 V reference (the ADR445) and an internal 2.5 V reference. The default operation on the AD7176-2 is to use the internal 2.5 V reference. The reference used for a conversion is selected by choosing the reference in the SETUPCONx registers associated with Setup 1, Setup 2, Setup 3, and Setup 4.
EVAL-AD7176-2SDZ User Guide UG-478 +5V +5V 0.1µF 0.1µF 0.1µF R92 6 7 8 AVSS AVDD1 AVDD2 R68 R91 R72 R34 21 AIN0 IN0 C19 R65 AD8656 C23 C59 IN1 R93 22 AIN1 R105 R100 R39 AD7176-2 R106 R99 SCLK 13 REFOUT 4 0.1µF DIN 12 R116 DOUT/RDY 11 R109 R115 CS 14 R110 R47 23 AIN2 R107 IN2 C28 AD8656 R117 C26 C27 IN3 24 AIN3 R125 R119 R120 R46 REF+ REF– 3 2 R126 0.1µF 0.1µF +5V ADR445* 0.1µF 5V VREF 0.1µF 4.7µF *USING ADR444 (4.
UG-478 EVAL-AD7176-2SDZ User Guide +5V +5V 0.1µF 0.1µF 0.1µF R96 IN0 8 7 6 ADA4940-1 R66 AVSS AVDD1 AVDD2 R34 R96 21 AIN0 C19 C23 C59 R77 22 AIN1 R75 IN1 R97 VOCM R39 R98 AD7176-2 +5V 2.5V 0.1µF 4 SCLK 13 REFOUT 0.1µF DIN 12 DOUT/RDY 11 R63 VOCM R64 +IN 0.4× IN2 CS 14 R47 23 AIN2 C28 C26 C27 24 AIN3 –IN 0.4× IN3 R78 R74 R46 REF+ REF– 3 2 AD8475 0.1µF +5V 0.1µF 5V VREF 0.1µF 4.7µF 11035-036 ADR445 Figure 7.
EVAL-AD7176-2SDZ User Guide UG-478 EVALUATION BOARD SETUP PROCEDURES After following the instructions in the Software Installation Procedures section, set up the evaluation and SDP boards as detailed in this section. 2. Warning The evaluation software and drivers must be installed before connecting the evaluation board and EVAL-SDP-CB1Z board to the USB port of the PC to ensure that the evaluation system is correctly recognized when it is connected to the PC.
UG-478 EVAL-AD7176-2SDZ User Guide EVALUATION BOARD SOFTWARE 4. SOFTWARE INSTALLATION PROCEDURES The EVAL-AD7176-2SDZ evaluation kit includes a CD containing software to be installed on your PC before you begin using the evaluation board. Select the location to install the software, and then click Next. (Figure 9 shows the default locations, which are displayed when the window opens, but you can select another location by clicking Browse.
A summary of the installation is displayed. Click Next to continue. 7. 11035-008 6. UG-478 Figure 11. AD7176-2 Evaluation Software Installation: Reviewing a Summary of the Installation Rev. A | Page 13 of 40 A dialog box informs you when the installation is complete. Click Next. 11035-009 EVAL-AD7176-2SDZ User Guide Figure 12.
UG-478 EVAL-AD7176-2SDZ User Guide Installing the EVAL-SDP-CB1Z System Demonstration Platform Board Drivers 3. Click Install to confirm that you would like to install the drivers. After the installation of the evaluation software is complete, a welcome window is displayed for the installation of the EVALSDP-CB1Z system demonstration platform board drivers. With the EVAL-SDP-CB1Z board still disconnected from the USB port of the PC, make sure that all other applications are closed, and then click Next.
EVAL-AD7176-2SDZ User Guide UG-478 SETTING UP THE SYSTEM FOR DATA CAPTURE Launching the Software After completing the steps in the Software Installation Procedures and Evaluation Board Hardware sections, set up the system for data capture as follows: After completing the steps in the Setting Up the System for Data Capture section, launch the AD7176-2 software as follows: 2. From the Start menu, select Programs > Analog Devices > AD7176-2 > AD7176-2 Evaluation Board Software.
UG-478 EVAL-AD7176-2SDZ User Guide Overview of the Main Window The main window of the software (see Figure 20) contains the significant control buttons and analysis indicators of the AD7176-2 software. ADC Setup Button Clicking ADC Setup, located near the top left of the main window (see Figure 20), opens the AD7176-2 Register Interface window.
EVAL-AD7176-2SDZ User Guide UG-478 Noise Test—Quick Start Demonstration To perform a noise test using the AD7176-2 evaluation board, LK5 to LK9 should be inserted so that the analog inputs are connected together. The internal reference should be enabled and made available at the REFOUT pin. The internal reference biases the analog inputs to an appropriate voltage. Click ADC Setup to open the AD7176-2 Register Interface window. The AD7176-2 should be configured as follows: a.
EVAL-AD7176-2SDZ User Guide 11035-021 UG-478 Figure 22. Example of the Main Window After Running a Noise Test Reading Samples from the ADC 3. The evaluation board is set up to use the external 5 V on-board reference (ADR445). To read samples from the ADC, 1. 2. The value in the Vref box is set to 5.0000 V by default to use the external 5 V on-board reference (ADR445). If a different reference is used, such as the 2.5 V internal reference, set the value in the Vref box accordingly.
EVAL-AD7176-2SDZ User Guide UG-478 DC Testing—Histogram The waveforms resulting from the gathered samples are shown in the top graph of the window. The right hand side of the window indicates which channel is selected and the value of the last sample of the batch. The conversions can be displayed as codes or as volts. The histogram resulting from the gathered samples is shown in the bottom graph.
UG-478 EVAL-AD7176-2SDZ User Guide Save File 2. The software can save the current captured data for later analysis (see Figure 24). Right-click on the waveform or histogram graph. A Save dialog box is displayed, prompting you to save the data to an appropriate folder location. 11035-019 1. Select Export Data from the drop-down menu that appears. Figure 24. Exporting Data to Save Results Rev.
EVAL-AD7176-2SDZ User Guide UG-478 EVALUATION BOARD SCHEMATICS AND ARTWORK 11035-022 Figure 25. Schematic—AD7176-2 Rev.
UG-478 EVAL-AD7176-2SDZ User Guide 11035-033 Figure 26. Schematic—Amplifiers Rev.
EVAL-AD7176-2SDZ User Guide UG-478 11035-023 Figure 27. Schematic—Power Supply Sequencing Rev.
UG-478 EVAL-AD7176-2SDZ User Guide 11035-024 Figure 28. Schematic—Regulators Rev.
EVAL-AD7176-2SDZ User Guide UG-478 11035-025 Figure 29. Schematic—SDP Connector Rev.
UG-478 EVAL-AD7176-2SDZ User Guide 2 1 1 1 B K 3 2 2 1 1 2 1 1 2 1 1 2 1 1 1 2 2 1 1 2 1 1 2 2 1 121 1 1 1 1 1 1 1 1 2 1 2 1 2 1 3 4 1 2 1 2 5 1 1 6 19 20 21 22 23 97 24 96 25 95 26 94 27 93 28 92 29 91 30 31 32 88 33 1 34 1 1 87 2 86 35 4 85 36 84 37 83 38 82 39 81 40 80 41 79 42 78 43 77 44 76 45 75 46 74 47 73 48 72 49 71 50 70 51 69 52 68 53 67 54 66 55 65 56 64 5 7 18 99 98 90
UG-478 11035-028 EVAL-AD7176-2SDZ User Guide 11035-029 Figure 32. Bottom Printed Circuit Board (PCB) Silkscreen Figure 33. Layer 1 Component Side Rev.
EVAL-AD7176-2SDZ User Guide 11035-030 UG-478 11035-031 Figure 34. Layer 2 Ground Plane Figure 35. Layer 3 Power/Ground Plane Rev.
UG-478 11035-032 EVAL-AD7176-2SDZ User Guide Figure 36. Layer 4 Component Side Rev.
UG-478 EVAL-AD7176-2SDZ User Guide BILL OF MATERIALS Table 8.
EVAL-AD7176-2SDZ User Guide Name C16 Value 1 DNI Tolerance PCB Decal C0402 C17 4.7 µF ±10% C18 0.1 µF C19 UG-478 Manufacturer N/A Part No. N/A Stock Code Do not insert C0603 Description Ceramic capacitor, not inserted, 0402 Ceramic capacitor, 6.3 V, X5R, 0603 Murata FEC 173-5527 ±10% C0402 Ceramic capacitor, 16 V, X7R, 0402 Murata 270 pF 5% R0402 Ceramic capacitor, 25 V, NPO, 0402 AVX C20 0.1 µF ±10% C0402 Ceramic capacitor, 16 V, X7R, 0402 Murata C21 0.
UG-478 EVAL-AD7176-2SDZ User Guide Name C46 Value 1 4.7 µF Tolerance ±10% PCB Decal C0603 Description Ceramic capacitor, 10 V, X5R, 0603 Manufacturer Kemet C47 4.7 µF ±10% C0603 Ceramic capacitor, 6.3 V, X5R, 0603 Murata C48 10 µF 1210 Ceramic capacitor, 50 V, X5R, 1210 Murata C49 10 µF 1210 Ceramic capacitor, 50 V, X5R, 1210 Murata C50 0.1 µF ±10% C0402 Ceramic capacitor, 16 V, X7R, 0402 Murata C51 0.1 µF ±10% C0402 Ceramic capacitor, 16 V, X7R, 0402 Murata C52 0.
EVAL-AD7176-2SDZ User Guide Name C86 Value 1 10 µF Tolerance ±10% PCB Decal C0805 C87 0.1 µF ±10% C0402 C88 10 µF ±10% C0805 C89 0.1 µF ±10% C0402 C90 1 nF ±10% C0603 C91 0.1 µF ±10% C0402 C92 1 nF ±10% C0603 D2 Red D4 Green LED0603HSMLC191 LED-0603 D5 BZT52 D6 Red GND GND1 GND2 GND3 GND4 GND5 GND6 GPIO0 GPIO1 J1 J2 J3 J4 J5 J6 J7 1× 4-pin UG-478 Part No.
UG-478 EVAL-AD7176-2SDZ User Guide Name J8 Value 1 J9 1× 4-pin Tolerance J10 PCB Decal CON\POWER8 (3_81PITCH) CON\POWER4 (3_81PITCH) SIP-7P LK2 LINK3P_TEXT_INV LINK-3P LK5 SIP-2P LK6 SIP-2P LK7 SIP-2P LK8 SIP-2P LK9 SIP-2P Q1 SOT23 Description 8-pin terminal header, pitch 3.81 mm, vertical Screw terminal block, pitch 3.81 mm 7-way, SSW, 2.54 mm vertical socket 7-way, SIP, 2.54 mm through hole header Ferrite bead, 0.3 Ω at dc, 1000 Ω at 100 MHz, 350 mA, 0805 Ferrite bead, 0.
EVAL-AD7176-2SDZ User Guide UG-478 Name R17 Value 1 10k2 Tolerance 0.01 PCB Decal R0402 Description SMD resistor Manufacturer Multicomp Stock Code FEC 1803137 N/A Part No. MC 0.0625W 0402 1% 10K2 MC 0.0625W 0402 1% 10K2 CRCW0402000 0Z0ED CRCW0402000 0Z0ED CRCW0402000 0Z0ED CRCW0402000 0Z0ED MC 0.0625W 0402 1% 86K6 MC 0.0625W 0402 1% 10K2 MC 0.0625W 0402 1% 30k1 CRCW0402000 0Z0ED CRCW0402000 0Z0ED N/A R18 10k2 0.01 R0402 SMD resistor Multicomp R19 0R 0.
UG-478 EVAL-AD7176-2SDZ User Guide Name R48 Value 1 100k Tolerance 1% PCB Decal R0603 Description SMD resistor Manufacturer Multicomp Stock Code FEC 9330402 Panasonic Part No. MC 0.063W 0603 1% 100K MC 0.125W 1206 0R MC 0.125W 1206 0R MC 0.125W 1206 0R MC 0.125W 1206 0R MC 0.0625W 0402 1% 60K4 CRCW04024K5 3FKED MC 0.0625W 0402 1% 61R9 RC0603FR072K4L CRCW0402000 0Z0ED CRCW0402000 0Z0ED CRCW0603000 0Z0EA CRCW0603000 0Z0EA CRCW0603000 0Z0EA CRCW06031K0 0FKEA CRCW0603000 0Z0EA ERA3AEB102V R49 0R 0.
EVAL-AD7176-2SDZ User Guide UG-478 Name R83 Value 1 0R Tolerance 0.01 PCB Decal R0603 Description Resistor, 0603 Manufacturer Vishay Draloric R84 0R 0.01 R0603 Resistor, 0603 Vishay Draloric R85 DNI 0.01 R0603 Resistor, not inserted, 0603 Vishay Draloric R86 DNI 0.01 R0603 Resistor, not inserted, 0603 Vishay Draloric R87 0R 0.01 R0603 Resistor, 0603 Vishay Draloric R88 1k 0.01 R0204 Resistor, 0402 Multicomp R89 1k 0.01 R0204 Resistor, 0402 Multicomp R90 DNI 0.
UG-478 EVAL-AD7176-2SDZ User Guide Name R115 Value 1 10R Tolerance 0.01 PCB Decal R0603 Description Resistor, 0603 Manufacturer Bourns R116 1k 0.1% R0603 Resistor, 0603 Panasonic R117 0R 0.01 R0603 Resistor, 0603 Vishay Draloric R118 DNI 0.01 R0603 Resistor, not inserted, 0603 Vishay Draloric R119 1k 0.1% R0603 Resistor, 0603 Panasonic R120 0R 0.01 R0603 Resistor, 0603 Vishay Draloric R121 0R 0.01 R0603 Resistor, 0603 Vishay Draloric R122 DNI 0.
EVAL-AD7176-2SDZ User Guide Name TSCLK Value 1 Description Test point, not inserted; keep hole clear of solder Test point, not inserted; keep hole clear of solder Test point, not inserted; keep hole clear of solder Test point, not inserted; keep hole clear of solder Test point, not inserted; keep hole clear of solder Test point, not inserted; keep hole clear of solder Test point, not inserted; keep hole clear of solder Test point, not inserted; keep hole clear of solder 32k I2C serial EEPROM Manufacturer
UG-478 EVAL-AD7176-2SDZ User Guide NOTES ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
